Answer:
1.6q + 10.7p + 10.2n
Step-by-step explanation:
With the perimeter they mean all sides added up together. Doing this results in a long expression:
3.5n + 6.5p + 6.7n - 7.9q + 9.5q + 4.2p
When adding terms like this, it is important to remember a rule: the numbers before letters can only be added to each other when they are linked to the same letter. So 2n + 2n becomes 4n, but 2n + 2p doesnt become 4np. When you know this, you can simplify the expression:
3.5n + 6.7n = 10.2n
6.5p + 4.2p = 10.7p
9.5q - 7.9q = 1.6q
This added together gets us 1.6q + 10.7p + 10.2n
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